327 Piece DIY Hydraulic Boxing Robots Injection Moulded STEM Construction Project and Play Kit Made from Durable ABS Pieces and PP Plastic Tubing with Metal Springs that Clip and Fit Together No Batteries Needed as Bots Move and Punch Through the Power of Hydraulics Controlled by Your Hand Madbo and Kangbo Boxing Bots are Designed to Move Like Real Boxers, they Swing, Jab and Uppercut Each Boxing Bot Measures Around 18 cm by 15 cm by 12 cm when Fully Constructed | Recommended for Ages 8+ Includes Detailed Instructions | Takes Around 3 Hours to Create | Requires Some Basic Tools, Manufacturer: Gift Universe Group Limited